Creating a Topology

[KieranBlakemore1]

I'm an intern and very new to working with ESRI for Local Government. I have set up a dataset containing my feature classes and created a geometric network within that dataset.  Those were all created successfully but when trying to create a topology I am receiving an error containing the following: "Cannot create topology. The selected feature dataset does not contain any feature classes which can participate in a topolgy." But I have multiple classes in that dataset, why is it that they cannot participate in a topology? Did I miss something when setting everything up?

Thanks,
Kieran

[MikeSullivan]

Some tools work on a topology, while others work on a network.  You can only have one or the other in a GDB.  In other words, you either work with a topology you've created, or a network that you've created.  Both cannot exists.

Hope this helps some.  I'm still working with the customization of the data model and the topology.  I prefer the topology to be built and correct before creating a network.